Vat dye of anthracene series.



I glacial acetic UNITED STATESPATENT OFFICE.

IIIIEINRIGH RAEDER. OF VOHWINKEL. NEAR ELBERFELD, GERMANY, ASSIGNOR TO FARBENFABRIKEN VORM. FRIEDR. BAYER & CO.. OF ELBERFELD, GERMANY, A

CORPORATION OF GERMANY.

VAT DYE OF ANTHRACENE SERIES.

No Drawing.

T 0 all whom it 'n iay concern:

Be it known-that I. HEINRICH RAEDER, doctor of philosophy. chemist. citizen of the German umpire. residing at Yohwinkel, near Ell erfel(l. Germany. have invented new and useful Improvements in Vat Dyes. of which the following is a specification.

My invention relates to the manufacture andproductiou of new vat dyes of the anthracene series dyeing cotton from the hydrosulfite vat beautiful fast Bordeaux to violet shades. Theprocess for their preparation consists in condensing para-aminoalkoxyanthraquinones with halogen substituted anthraquinones or by condensing paraha-logen substituted alkoxyanthraquinones with aminoantln'aquinones.

The new products are after being dried and pulverized. colored powders 'iractically insoluble in water and in the usual organic solvents and soluble in concentrated sulfuric acid with t'ronra blue to green color. They yield on treatment with hydrosultite and caustic soda lye vatssuitable for dyeing cotton t'ast Bordeauxto violet shades.

' In carrying out the new process practically I can proceed as follows. the parts being by. weight Example: A mixtureot' 30 parts of 1.-laminomethoxyanthraquinone. 30 parts betachloroanthraquinone. -1 parts of cuprous chlorid. 25 parts of anhydrous sodium acetate and 300-parts of naphthalene is heated to boiling for about (.3 hours. The resulting dye is precipitated from the melt with naphtha. After cooling to 10 to C. the dye is filtered off. washed with ligroin, acid. hydrochloric acid and water and dried. It is after being dried and pulverized a dark powder practically 1nsoluble in water and in the usual organic solvents; it is soluble in concentrated sulfuric acid with a greenislrblue color. By

treatment with reducing agents, e g. hy dr0- 's'ulfite and NaOH a brown vat is obtained dyeing cotton beautiful Bordeaux shades.

Specification of Letters Patent. Application filed October 21, 1909. Serial No. 523,803.

Patented Feb. 22, 1910.

Herewith the properties of some of the new products are giveni 1.4-aminomethoxyanthraquinone+1-chloroauthraquinone dyes redviolet.1. laminonlethoxyanthraquinone+1.(3- methoxychloroanthraquinoue dyes Bordeaux, 1.4 amiiiomcthoxyanthraquinone+ 1.6 methylaminochloroanthraquinone dyes violet, 1.8 dimethoxy l aminoanthraquinone+2- chloroanthraquinone dyes Bordeaux. LS-dimethoxy-1.5-diaminoanthraquinonc+2 mol. Q-chloroanthraquinone dyes violet.

I claim: 1

1. The herein described new vat dyestufis of the anthracene series which can be obtained from a para-alninoalkoxyanthraquinonc and a halogen substituted anthraquinone. which dyestutt's are. after being dried and pulverized. colored powders practically insoluble in water and in the usual organic solvents. soluble in concentrated sulfuric acid with from a blue to green color: giving vats with hydrosultite and caustic soda lye. which vats dye umnordanted cotton fast Bordeaux to violet shades. substantially as described.

2. The herein described new vat dycstutl ot' the anthraccne series which 'an be ob tained by condensing 1.1-methoxyaminoanthraquinone with 2--chloroanthraquinone, which dyestufl' after being dried and pulverized. a dark powder which is practically insoluble in water and in the usual organic solvents: soluble in ctmccntratcd sulfuric acid with a greenish-blue color; giving a brown vat with hydrosultite and caustic soda lye. which vat dyes cotton Bordeaux shades, substantially as described.

In' testimony whereof I have hereunto set my handin the presence of two subscribing witnesses.

HEINRICH RAEDER.

'itnesses Or'm Komo, CHAS. J. \VRIGHT. 

